Drupal Redirect Callback Module

This drupal module (tested in 4.7.x, should work in 5.x) creates a path which takes one URL as an argument and simply does a 302 redirect to that URL. One can use this module to track clicks to offsite links. By passing them all through this module, said clicks will show up in your web server logs.

However, due to drupal's heavy bootstrap process, this will be much slower than a php file which does exactly the same thing.